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Communications Engineering Coaching Materials: Section 5 Module 5

This is the Section 5 Module 5 of the compiled Communications Coaching Materials taken from different sources including but not limited to Communications books, past Board Exams Questions, Journals and the Internet.

This is the Section 5 Module 5 of the compiled Communications Coaching Materials taken from various sources including but not limited to past Board Examination Questions in Electronic System and Technologies (EST), Communications Books, Journals and other Communications References. This particular Coaching Notes in Communications Engineering has random Questions and Answers in random topics. Make sure to familiarize each questions to increase the chance of passing the ECE Board Exam.

86. delta matching system → What term describes a method used to match a high-impedance transmission line to a lower impedance antenna by connecting the line to the driven element in two places, spaced a fraction of a wavelength on each side of the driven element center?

87. gamma matching system → What term describes an unbalanced feed system in which the driven element is fed both at the center of that element and a fraction of a wavelength to one side of center?

88. stub matching system → What term describes a method of antenna impedance matching that uses a short section of transmission line connected to the antenna feed line near the antenna and perpendicular to the feed line?

98. Class AB (vacuum tube) → ___________ amplifier…. Anode current that conducts more than half a cycle but not less than half a cycle

99. Class C (vacuum tube ____________ amplifier….. anode current that conducts less than half of the cycle

100. Fantastron → free-running

101. 60 wavelengths → an electrically large antenna which is greater than

102. the resistance decreases, capacitance increases → If the mobile antenna is decreased, and frequency decreases

103. Laser Altimeter → altimeter at the optical band

104. dual-beam antenna → strong clutter

105. Gregorian antenna → two concave mirrors

106. Stack up two yagis that are perpendicular at each other. The feed are both on the same plane and fed up at 90 degrees out of phase. → To make a linearly polarized antenna to a circularly polarized